/* NVClock 0.8 - Linux overclocker for NVIDIA cards
*
* site: http://nvclock.sourceforge.net
*
* Copyright(C) 2001-2005 Roderick Colenbrander
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include <stdio.h>
#include <stdlib.h>
#include "nvclock.h"
#include "backend.h"
static int CalcSpeed(int base_freq, int m, int n, int p)
{
return (int)((float)n/(float)m * base_freq) >> p;
}
/* Generic clock algorithm for all cards upto the Geforce4 */
float GetClock(int base_freq, unsigned int pll)
{
int m, n, p;
m = pll & 0xff;
n = (pll >> 8) & 0xff;
p = (pll >> 16) & 0x0f;
if(nv_card->debug)
printf("m=%d n=%d p=%d\n", m, n, p);
return (float)CalcSpeed(base_freq, m, n, p)/1000;
}
/* Calculate the requested speed. */
static void ClockSelect(int base_freq, int clockIn, int *PLL)
{
int m, n, p, bestm, bestn, bestp;
int diff, diffOld, mlow, mhigh, nlow, nhigh, plow, phigh;
diffOld = clockIn;
if(base_freq == 14318)
{
mlow = 7;
mhigh = 14;
nlow = 14;
nhigh = 255;
}
else
{
mlow = 6;
mhigh = 13;
nlow = 14;
nhigh = 255;
}
if(clockIn > 250000)
{
mlow = 1;
mhigh = 6;
nlow = 14;
nhigh = 93;
}
if(clockIn > 340000)
{
/* When DDR memory is used we should perhaps force mhigh to 1, since
* on some cards the framebuffer needs to be reinitialized and image corruption
* can occur.
*/
mlow = 1;
mhigh = 2;
nlow = 14;
nhigh = 93;
}
/* postdivider locking to improve stability.
* in the near future we will provide some tuning options for the
* overclocking algorithm which will extend this.
*/
plow = (*PLL >> 16) & 0x0f;
phigh = (*PLL >> 16) & 0x0f;
/*
Calculate the m and n values. There are a lot of values which give the same speed;
We choose the speed for which the difference with the request speed is as small as possible.
*/
for(p = plow; p <= phigh; p++)
{
for(m = mlow; m <= mhigh; m++)
{
for(n = nlow; n <= nhigh; n++)
{
diff = abs((int)(clockIn - CalcSpeed(base_freq, m, n, p)));
/* When the new difference is smaller than the old one, use this one */
if(diff < diffOld)
{
diffOld = diff;
bestm = m;
bestn = n;
bestp = p;
#if 0
/* When the difference is 0 or less than .5% accept the speed */
if(((diff == 0) || ((float)diff/(float)clockIn <= 0.005)))
{
*PLL = ((int)bestp << 16) + ((int)bestn << 8) + bestm;
return;
}
#endif
}
}
}
}
*PLL = ((int)bestp << 16) + ((int)bestn << 8) + bestm;
return;
}
static void set_gpu_speed(unsigned int clk)
{
int PLL;
/* MHz -> KHz */
clk *= 1000;
PLL = nv_card->PRAMDAC[0x500/4];
/* HERE the new clocks are selected (in KHz). */
ClockSelect(nv_card->base_freq, clk, &PLL);
/* Unlock the programmable NVPLL/MPLL */
nv_card->PRAMDAC[0x50c/4] |= 0x500;
/* Overclock */
nv_card->PRAMDAC[0x500/4] = PLL;
}
static void set_memory_speed(unsigned int clk)
{
int PLL = nv_card->PRAMDAC[0x504/4];
/* MHz -> KHz */
clk *= 1000;
/* This is a workaround meant for some Geforce2 MX/Geforce4 MX cards
* using SDR memory. Gf2MX/Gf4MX cards use 4x16 SDR memory report
* twice as high clockspeeds. I call that "fake ddr".
* By detecting the memory type, pci id and clockspeed we check
* if this occurs. It is a workaround.
*/
if(nv_card->mem_type == SDR && ( nv_card->device_id == 0x110 || nv_card->device_id == 0x111
|| nv_card->device_id == 0x172 || nv_card->device_id == 0x17a))
{
if(GetClock(nv_card->base_freq, PLL) > 280) clk *= 2;
}
/* Here the clocks are selected in kHz */
ClockSelect(nv_card->base_freq, clk, &PLL);
/* Unlock the programmable NVPLL/MPLL */
nv_card->PRAMDAC[0x50c/4] |= 0x500;
/* Overclock */
nv_card->PRAMDAC[0x504/4] = PLL;
}
static float get_gpu_speed()
{
int pll = nv_card->PRAMDAC[0x500/4];
/* Unlock the programmable NVPLL/MPLL */
nv_card->PRAMDAC[0x50c/4] |= 0x500;
if(nv_card->debug == 1)
{
printf("NVPLL_COEFF=%08x\n", pll);
}
return (float)GetClock(nv_card->base_freq, pll);
}
static float get_memory_speed()
{
int factor = 1;
int pll = nv_card->PRAMDAC[0x504/4];
/* Unlock the programmable NVPLL/MPLL */
nv_card->PRAMDAC[0x50c/4] |= 0x500;
/* This is a workaround meant for some Geforce2 MX/Geforce4 MX cards
* using SDR memory. Gf2MX/Gf4MX cards use 4x16 SDR memory report
* twice as high clockspeeds. I call that "fake ddr".
* By detecting the memory type, pci id and clockspeed we check
* if this occurs. It is a workaround. We divide the memclk later by 2.
*/
if(nv_card->mem_type == SDR && ( nv_card->device_id == 0x110 || nv_card->device_id == 0x111 ||
nv_card->device_id == 0x172 || nv_card->device_id == 0x17a || nv_card->device_id == 0x182 \
|| nv_card->device_id == 0x183))
{
if(GetClock(nv_card->base_freq, pll) > 280)
{
factor = 2;
}
}
if(nv_card->debug == 1)
{
printf("MPLL_COEFF=%08x\n", nv_card->PRAMDAC[0x504/4]);
}
return ((float)GetClock(nv_card->base_freq, pll)) / factor;
}
static float nforce_get_memory_speed()
{
unsigned short p = (pciReadLong(0x3, 0x6c) >> 8) & 0xf;
if(!p) p = 4;
return 400.0 / (float)p;
}
static void reset_gpu_speed()
{
/* Unlock the programmable NVPLL/MPLL */
nv_card->PRAMDAC[0x50c/4] |= 0x500;
/* Set the gpu speed */
nv_card->PRAMDAC[0x500/4] = nv_card->nvpll;
}
static void reset_memory_speed()
{
/* Unlock the programmable NVPLL/MPLL */
nv_card->PRAMDAC[0x50c/4] |= 0x500;
/* Don't overclock the memory of integrated GPUs */
if(nv_card->gpu == NFORCE)
return;
/* Set the memory speed */
nv_card->PRAMDAC[0x504/4] = nv_card->mpll;
}
static void nv_set_state(int state)
{
}
void nv_init(void)
{
float memclk, nvclk;
/* Get the base frequency */
nv_card->base_freq = (nv_card->PEXTDEV[0x0000/4] & 0x40) ? 14318 : 13500;
if(nv_card->arch & (NV17 | NV25))
{
if (nv_card->PEXTDEV[0x0000/4] & (1<<22))
nv_card->base_freq = 27000;
}
nv_card->set_state = nv_set_state;
nv_card->get_gpu_speed = get_gpu_speed;
nv_card->set_gpu_speed = set_gpu_speed;
nv_card->get_memory_speed = get_memory_speed;
nv_card->set_memory_speed = set_memory_speed;
nv_card->reset_gpu_speed = reset_gpu_speed;
nv_card->reset_memory_speed = reset_memory_speed;
/* Mobile GPU check; we don't want to overclock those unless the user wants it */
if(nv_card->gpu == MOBILE)
{
nv_card->caps = ~(~nv_card->caps | GPU_OVERCLOCKING | MEM_OVERCLOCKING);
}
else if(nv_card->gpu == NFORCE)
{
/* Only support gpu overclocking because the memory is normal system memory of which we can't adjust the clocks */
nv_card->caps |= GPU_OVERCLOCKING;
nv_card->get_memory_speed = nforce_get_memory_speed;
nv_card->set_memory_speed = NULL;
nv_card->reset_memory_speed = NULL;
}
else
nv_card->caps |= (GPU_OVERCLOCKING | MEM_OVERCLOCKING);
/* Set the speed range */
memclk = GetClock(nv_card->base_freq, nv_card->mpll);
nvclk = GetClock(nv_card->base_freq, nv_card->nvpll);
nv_card->memclk_min = (short)(memclk * .75);
nv_card->memclk_max = (short)(memclk * 1.5);
nv_card->nvclk_min = (short)(nvclk * .75);
nv_card->nvclk_max = (short)(nvclk * 1.5);
/* Hack.
* Nvidia was so nice to ship support both DDR and SDR memory on some gf2mx and gf4mx cards :(
* Because of this the speed ranges of the memory speed can be different.
* Check if the card is a gf2mx/gf4mx using SDR and if the speed is "too" high.
* Then adjust the speed range.
*/
if((nv_card->device_id == 0x110 || nv_card->device_id == 0x111 \
|| nv_card->device_id == 0x172 || nv_card->device_id == 0x182 \
|| nv_card->device_id == 0x183) && ((nv_card->PFB[0x200/4] & 0x1) == SDR) && memclk > 280)
{
nv_card->memclk_min /= 2;
nv_card->memclk_max /= 2;
}
}
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